# SPC Tools: Cpk Calculator — Control Charts, AQL & OEE

> Control Charts, AQL & OEE (iPhone/iPad app by Osman Seven.)

- Source: https://appshunter.io/ios/app/spc-tools-cpk-calculator/id6759008455 (this page in markdown: same URL + `.md`)
- Developer: [Osman Seven](https://appshunter.io/developer/1875631963)
- Category: Productivity, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 11 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China), European Spanish, Turkish
- Released: 2026-02-21
- Data updated: 2026-07-22
- User reviews in markdown: https://appshunter.io/ios/app/spc-tools-cpk-calculator/id6759008455/reviews.md

## What is SPC Tools?

Run SPC, Cp/Cpk, control chart, AQL, OEE and Six Sigma calculations without spreadsheets. SPC Tools gives quality engineers a fast offline toolkit for manufacturing decisions on the shop floor.

Built for quality engineers, manufacturing teams, Six Sigma practitioners, inspectors and students, SPC Tools brings the most common quality calculations into one clean iPhone and iPad app.

PROCESS CAPABILITY
- Cp / Cpk process capability calculator
- Pp / Ppk process performance calculator
- Clear capability interpretation

CONTROL CHARTS
- X-bar R control charts
- I-MR individual moving range charts
- UCL, CL and LCL results
- Out-of-control point detection

MEASUREMENT & INSPECTION
- Gage R&R / MSA calculator
- AQL sampling plans based on ISO 2859-1
- Sample size calculator

MANUFACTURING PERFORMANCE
- OEE calculator
- Availability, performance and quality breakdown
- Sigma level, DPMO and yield conversion

QUALITY TOOLS
- Pareto analysis
- Histogram analysis
- FMEA with RPN priority
- Ishikawa fishbone diagram
- Hypothesis testing
- Alpha, beta and power analysis

WORK FASTER
- Save calculation history
- Review previous results
- Use the built-in formula reference
- Works offline
- No account required
- Data is processed on device

FREE & PRO
SPC Tools includes 5 free calculators. SPC Tools Pro unlocks all 15 calculators with a 7-day free trial.

Download SPC Tools and replace scattered spreadsheets with a practical quality engineering calculator built for daily manufacturing work.

Payment will be charged to your Apple ID account at confirmation of purchase. Subscription automatically renews unless canceled at least 24 hours before the end of the current period. You can manage and cancel your subscriptions in your App Store account settings.

Privacy Policy: https://saevaexe.github.io/spctools/privacy.html
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Yearly Pro | $19.99 | per year |
| Monthly Pro | $2.99 | per month |



## Version history (last 5 releases)

### 1.2.1 — 2026-07-12

Refreshed localized App Store visuals, improved the Settings experience, and refined layouts across supported languages.

### 1.2.0 — 2026-07-12

Improved onboarding, subscription details, Turkish decimal input, localization, and UI refinements for SPC calculators.

### 1.1.1 — 2026-02-26

• Redesigned subscription screen with clearer pricing
  • Fixed decimal input for Turkish locale
  • Improved Turkish localization throughout the app
  • Minor UI improvements and bug fixes

### 1.1 — 2026-02-22

- Redesigned onboarding experience with 5 professional pages
  - New custom paywall design with clear plan comparison
  - Improved subscription details and legal disclosures
  - UI refinements: shorter banner text, better localization
  - Bug fixes and performance improvements

### 1.0 — 2026-02-22

No release notes.

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## More apps by Osman Seven

- [Electrical Calculator ElecCalc](https://appshunter.io/ios/app/electrical-calculator-eleccalc/id6758902534)
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- [Çeyizim: Trousseau Planner](https://appshunter.io/ios/app/ceyizim-trousseau-planner/id6762088174)
- [Payment Calendar: Bill Planner](https://appshunter.io/ios/app/payment-calendar-bill-planner/id6779705923)

All apps by Osman Seven: https://appshunter.io/developer/1875631963

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-22.*